IBM DTLA-307075 Hard Drive Specifications - Page 107

Identify Device Data, 15.3 Exceptions in Address Offset Mode, Before Enable Address Offset Mode

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Before Enable Address Offset Mode A reserved area has been created using a non-volatile Set Max command. Accessible (User Area) Non-Accessible (Sytem reserved area) LBA 0 LBA R LBA M After Enable Address Offset Mode Accessible (System reserved area) Non-Accessible (User area) LBA 0 LBA M-R LBA M After Set Max Address Command using the Value Returned by Read Max Address Any commands which access sectors across the LBA M-R are aborted with error. Accessible (System reserved area) Accessible (User area) LBA 0 LBA M-R LBA M Figure 83. Device address map before and after Set Feature 10.15.2 Identify Device Data Identify Device data word 83 bit 7 indicates the device supports the Address Offset Feature. Identify Device data word 86 bit 7 indicates the device is in Address Offset mode. 10.15.3 Exceptions in Address Offset Mode Any commands which access sectors across the original native maximum LBA are rejected with error even if the access protection is removed by an Set Max Address command. The Read Look Ahead operation is not carried out even when enabled by Set Feature command. Deskstar 40GV & 75GXP hard disk drive specifications 95

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Before Enable Address Offset Mode
A reserved area has been created using a non-volatile Set Max command.
Non-Accessible
(Sytem reserved
area)
Accessible
(User Area)
LBA 0
LBA R
LBA M
After Enable Address Offset Mode
Non-Accessible
(User area)
Accessible
(System reserved
area)
LBA 0
LBA M–R
LBA M
After Set Max Address Command using the Value Returned by Read Max Address
Any commands which access sectors across the LBA M–R are aborted with error.
Accessible
(User area)
Accessible
(System reserved
area)
LBA 0
LBA M–R
LBA M
Figure 83. Device address map before and after Set Feature
10.15.2 Identify Device Data
Identify Device data word 83 bit 7 indicates the device supports the Address Offset Feature.
Identify Device data word 86 bit 7 indicates the device is in Address Offset mode.
10.15.3 Exceptions in Address Offset Mode
Any commands which access sectors across the original native maximum LBA are rejected with error
even if the access protection is removed by an Set Max Address command.
The Read Look Ahead operation is not carried out even when enabled by Set Feature command.
Deskstar 40GV & 75GXP hard disk drive specifications
95